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Ethylene Oxide Gamma Electron Beam X-ray
Methodology
Penetration of sterilant gas into
packaged product Irradiation of product using
photons from radioisotope
Product sterilized using
ionizing energy from electron
beam
Products sterilized using
ionizing energy from
Rhodotron electron beam
Efficacy
Process efficacy confirmed by
biological indicators and/or
process monitoring
Process parameters confirmed by
dosimetry
Process parameters confirmed
by dosimetry
Process parameters
confirmed by
dosimetry
Penetration Requires gas permeable packaging
and product design
Good penetration complete even
at high densities (> 0.4 gm/cc)
Efficient penetration at bulk
densities between 0.05 – 0.30
gm/cc
Excellent penetration
for all product types
Material
Compatibility
Very few material compatibility
concerns Liquids are generally not
recommended
Compatible with most materials;
plastics need to be evaluated
Avoid acetals, PTFE (teflon),
unstable polypropylene Additives
are available to correct issues.
Negative effects are frequently
less pronounced or eliminated
Similar to gamma,
however negative
effects are frequently
less pronounced or
eliminated
Turnaround
Time
Days: Conventional = 9-10 days.
EOExpress® = one day
Hours: time varies based on dose
requirements
Minutes: time varies based on
dose requirements
Hours: time varies
based on dose
requirements
Process
Complex process: Variables include
exposure time, temperature,
humidity and EO concentration
Non-process variables impacting
lethality include load density, packaging,
and winter shipping conditions.
Simple process: Variables include
time in the cell and isotope load
Complex process: Variables
include scan height,
processing speed, number of
passes, and orientation to the
beam
Moderately complex
process: Variables
include processing
speed, number of
passes and number of
pallets on conveyor
Product
Handling
Traditional processing: pallets are
transferred between stages via fork
truck or conveyor system
EOExpress® processing: entire
process takes place in the
sterilization chamber
Aluminum totes/pallets with
product placed in pre-determined
loading pattern
Aluminum carriers with product
placed in pre-determined
loading pattern, or boxes
placed directly onto conveyor
Products processed
via pallets, in pre-
determined loading
pattern
T E C H N I C A L T I P
F O R M O R E I N F O R M A T I O N
STERIS Applied Sterilization Technologies
Web: www.steris-ast.com // Email: [email protected]
(EMEAA) +44 (0) 8456 88 99 70
(Americas) 877.783.7479
O V E R V I E W O F S T E R I L I Z A T I O N T E C H N O L O G Y C O M P A R I S O N
TechTip #58 | Rev 1, 01/2020
